This is certainly an interesting design, but that sword just eats at me.

There's just no way that such a contraption would work with the design applied to it. Right off the top, the shape of the 'blade' does not accommodate the streamlined mechanism required for an effective chainsaw. On top of that, with the width of the 'chain' on that blade, that guard wouldn't keep the chain from cutting into the wielders own hand. That's not even getting into the lack of a mechanism to rotate the chain on the blade.